Vibrator



sept. 1o, 1940. A, w, MALL 2,214,142

VIBRATOR Filedv April 6,` 1938 2 Sheets-Sheet l sept. 1o, 1940.

` A. w. MALL 2,214,142

VIBRATOR Filed April 6, 1938 2 Sheets-Sheet 2 INVENT OR.

^ 'ATTORNEY.

Patented Sept. 10, l1940 UNIT-ETD YSTYA'lflEli 6 Claims.

My invention relates to improvements in vibrators and similar devices.

My invention relates more particularly to improvements in vibrators for use in compacting plastic, semi-plastic -and semi-liquid masses in order to secure a denser and more solid mass.

The principal object of the present invention is to provide a vibratory mechanism which may be 'inserted within unset concrete or other similar materials and which ,produces high frequency radial vibrations.

A further object of my invention is to provide an -improved vibrating machine which will place and compact .a given mass of concrete in less time than has 'heretofore been possible.

A further object of the present invention is to provide .an improved construction of vibrating mechanism whereby a maximum vamount of unset :concrete or other similar material may be worked upon at one time.

'The vibrators or vibratory mechanisms at present -on the `market are in the form of an elongated shell or cylinder within which an offset weight is revolved at a high rate of speed. These 25. vibrators are ordinarily driven by means of a flexible shaft or by a 'fixed shaft from a motor or Yother source of power remotely placed from the vibrator. It is a well known fact that the proportion of the diameter A.to the length Vof the 30'. vibrating mechanism and .the rate of speed at which :the unbalanced weight is driven, and the size of the same control the area which is aected by the Vibrations that areproduced.

The principal object of the present invention is I5. to provide an improved vibrator of the type described Ycapable of causing vibrations .throughout a greater area than has heretofore beendone with a vibrator and power of the same size and amount as heretofore described. This vobject is accomplished by providing a plurality of arms or extensions from a collar welded or otherwise rigidly secured about the exterior of the vibrator casing so that the vibrations will .be transmitted through the arms or extensions.

A further object of Athe invention is .to provide by the use of arms such .as I have mentioned, .a platform or .support for -the vibrator when `not in use. By transmitting the vibrations 50 from the vibrator casing through the various arms which I have described, it will be obvious that more energy can be applied to the compacting of the unset concrete and a greater area can be worked upon at the same time, thus materially diminishing the amount of time or labor required to compact a given quantity Yof poured or unset cement.

Other objects and advantages will be Amore apparent from the following description wherein reference is had to the accompanying two sheets of drawings upon'which Fig. 1 is a side elevational view showingv generally a motor, a flexible shaft drive and -my improved vibrator;

Fig. 2 is a plan sectional lView through the vibrator taken generally on the lines Y2 2 of Fig.1;

Fig. 3 is a fragmentary side elevation of the upper portion of the vibrator with parts broken away in section vrto more'clearly show other parts;

Fig. 4 is a horizontal sectional View similar to Fig. 2 of amodiiied formfof construction;

Fig. 5 is a Ihorizontal sectional -view similar to Fig. 2 of a still further yrnodiiied form of construction;

Fig. 6 is a 'horizontal sectional `View similar to Fig. 2 of a `further `modified form of construction;

Fig. 7 is a horizontal sectional view similar to Fig. 2 of a further modified form of construction;

Fig. 8 is a side elevational View of .'themodiiied form of vibrator construction shown in Fig. 7;

Fig. .9 is a side relevational view of a further modified form of vibrator construction; and

Fig. 10 is a side elevational View of a motor and vibrator assembly using a comparatively rigid shaft and housing.

In ythe embodiment of my invention which I have chosen to illustrate, I have shown an electric `motor l0 provided with a plurality of supporting handles l2 and a conduit lIl leading from a `suitable source .of electrical energy. I provide a ilexible shaft drive lextending from the motor to the unbalanced weight I8 lin the inside of housing 20 of the vibrator. The motor, exible shaft and vibrator .may 'be generally similar in construction to that shown and described in my copending application for patent, Serial Number 18,269 `now matured into Patent #2,148,765 dated February 28, 1939. vSince a detailed description of the variouselements is vprovided in that applivcation, further description of these parts will not be provided herein.

In order to be `able to operate in a larger area than is possible with the vibrator 'housing 20 alone, I have provided a ring .22 `secured about the exterior surface of the vibrator housing 20. I .provide a plurality .of radially extending arms 24 which extend from .the housing .20 of the vibrator and terminate in downwardly extended portions 26. The extensions 26 are preferably of a length to extend beyond the lowest portion of the vibrator 20 so that when the mechanism is not in use the extensions may serve as a support for the vibrator.

In Fig. 4 I have shown a modified form of the invention in which the arms 24a have been extended tangentially from the supporting collar 22. In view of the fact that the unbalanced weight I8 is being revolved at a high rate of speed, I have found that the vibrations are somewhat more effective by reason of this type of construction.

In Fig. 5 I have shown a still further modified form of construction in which I have provided the arcuately shaped arms 24h extending radially and tangentially from the collar 22. v

While in the above mentioned forms I have preferably shown the arms and their extensions as hollow tubular members to secure greater vibratory eifect therefrom, they may also be formed of rod members. Thus, in Figs. 7 and 8, I have shown the arm members 24e in the form of comparatively small rods, and to increase the amount of vibration about the area of the vibrator, I have provided a large number of radially extending arms.

In Fig. 6 I have shown a still further modied form of construction wherein I have provided a plurality of radially disposed arms 24d spaced approximately apart. This type of construction is particularly effective as a support for the vibrator when not in use by reason of the fact that the same may be firmly supported upon the tripod construction upon uneven surfaces.

In Fig. 9, I have shown a still further modied form of construction wherein I provide a pair of oppositely directed radially extending arms 30, provided with a plurality of downwardly depending finger means 30a. A vibrator constructed in this manner may be used for compacting concrete in comparatively narrow wall formations when the concrete is poured between forms.

In Fig. 10, I have shown the manner in which the motor ID and vibrator 2U, connected by a comparatively short flexible drive in a semi-rigid shaft housing |63, permits the supporting the motor and vibrator by the downwardly depending arms 2B.

From the above and foregoing description it will be apparent to those Skilled in the art that I have provided a construction of vibrator wherein by the use of a given size vibrator housing and motor, the vibrations will effect a larger area, thus enabling workmen to compact a given quantity of unset concrete or similar material in a shorter length of time. The application of the above described type of vibrator is particularly adaptable to floor or bridge deck construction.-

It may also be used to advantage in building construction where large surface areas are compacted, such for example as concrete floors and roads.

With the form of construction shown in Fig, 10, it will be obvious that workmen will be relieved from a large amount of fatigue suffered at the present time by reason of the fact that they must always be supporting the comparatively heavy motor l0. By reason of this, fewer workmen will be employed and those employed will perform a greater amount of actual compacting of unset concrete.

While I have illustrated and described a specific embodiment of my invention and some modied and said casing, said casing having a plurality of radially directed arms extending outwardly and beyond the end of said casing whereby said casing and housing are capable of being supported by said arms.

2. In a vibrator mechanism for compacting concrete, a casing, an unbalanced vibratory element rotatably mounted therein, power means for rotating said element, and a plurality of rigid arms rigidly attached to said casing and projecting therefrom, said arms having portions lying in a common plane on either side of and spaced from said casing and vibratory element, and adapted to vibrate in unison with said casing so as to effectively transmit vibrations to the surrounding concrete throughout the entire extent of said arms.

3. In a vibrator mechanism for compacting concrete, a casing, an unbalanced vibratory element rotatably mounted therein, power means for rotating said element, and a plurality of rigid arms rigidly attached to said casing and projecting therefrom, said arms having portions radiating therefrom in at least three directions spaced from each other by angles of less than and terminating in spaced, substantially parallel portions embracing a space in which said casing and vibratory element are located, and adapted to vibrate in unison with said casing so as to effectively transmit vibrations to the surrounding concrete throughout the entire extent of the said arms.

4. In a vibrator mechanism for compacting concrete, a casing, a vibratory element disposed in said casing and adapted to develop vibration therein, a plurality of rigid arms rigidly attached to said casing and projecting therefrom, said arms having portions embracing a space in which said casing and vibratory element are located, and adapted to vibrate in unison with said casing so as to effectively transmit vibrations to the surrounding concrete throughout the entire extent of said arms.

5. A vibrator mechanism as defined in claim 4 wherein the direction of vibration of said vibratory element is transverse to the embracing portions of said arms.

6. In a portable vibrator for compacting concrete and the like, a motor, a vibrator casing, a vibratory element in said casing, a drive shaft housing, attached at its respective ends to said motor and casing, and adapted to transmit support from one to the other, and a plurality of vibration distributing arms circumferentially spaced less than 180 from each other and attached to said casing and extending at least as far as or beyond the end thereof remote from the motor so as to provide means for supporting said casing and motor in an upright position.

ARTHUR WILLIAM MALL.

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